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US3303449A
Expired / Lapsed
US
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Toroidal magnetic cores having varying cross-sectional areas
Assignee: Individual
•
Filing: 1964-02-28
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Granted: 1967-02-07
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Expires: 1984-02-28
Abstract
No abstract record available.
Inventors
- 👤 Stimler Morton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:04
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/06; H01F17/062; H01F41/00; H01F41/02; H01F41/0206; H01F41/0213
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1774856A
Cited
US1875590A
Cited
US2799822A
Cited
FR1100710A
Cited
US2918660A
Cited
US3157866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |